haha not from N Tex nor am i a Jetta driver, but i do drive a diesel...and i must say that in my experience down here in South East Tx, the best diesel stations are either truck stops, or Shell stations
BP - Amoco Premium always gave me the best mileage in my TDI or Powerstroke. Not many BP's North of Dallas. Whichever station it is, the higher the cetane rating the better the MPG. And Shell is good too!
Most don't and when you ask the person running the cash register, you mostly get a blank stare. I wrote BP directly and they told me what their cetane was. I monitor my mileage pretty close. BP was first, Shell was second in mileage. Note: Pilot is basically swill. MPG went done on that stuff.